Borough of Princeton Weather Forecast

    • 36
    • 59

    Mostly Cloudy

    • 37
    • 56

    Mostly Cloudy

    • 40
    • 55

    Chance Rain Showers

    • 44
    • 57

    Chance Rain Showers

    • 42
    • 57

    Chance Rain Showers

    • 41
    • 56

    Chance Rain Showers

Today 26 Oct Mercer

Areas of frost in the morning. Mostly sunny. Highs in the upper 50s. North Winds around 5 Mph.

Tonight 26 Oct Mercer

Partly cloudy. Lows in the mid 30s. North Winds around 5 Mph.

Graph Plots Open in Graphs

  • Temperature Forecast NOAA

  • Temperature Real-Time

Borough of Princeton Temperature Statistics

October Temperature

Trenton, Mercer County Airport (9.3 miles)

  • Lowest 10 October, 2025

    39 °F

  • Average October

    58.5 °F

  • Highest 5 October, 2025

    82.9 °F

Climate (2020–Present)

Trenton, Mercer County Airport (9.3 miles)

Take a look at our website widgetsAvailable free! Find Out More

  • Average Low 2020–2025

    46.3 °F

  • Average 2020–2025

    55.4 °F

  • Average High 2020–2025

    64.5 °F
Get WillyWeather+ to remove ads